Made of nylon and elastane, it slides on like a second skin without fussy fasteners. While the buttery-soft microfiber material feels lightweight, it provides just the right amount of support. Once I had it on, there were no gaps or puckers in sight, and hours later I felt like I was wearing nothing at all. The bra also comes with removable pads, so you can choose whether to have that extra bit of lift or not. I typically always take out removable pads for a smoother fit, but I found I actually didn’t mind them in this style because they’re so thin, offering barely there support. And as the name suggests, the bra has convertible straps, too. Leave them in a traditional style or create a criss-cross back that’s ideal for wearing underneath racerback tops. To buy: From$42; amazon.com.